Micro LED Display Pixel Light Convergence
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Solution Overview
Problem
Existing image display devices with micro light-emission elements face challenges in effectively utilizing emitted light without increasing the size of the imaging optical system, leading to limitations in brightness and durability, particularly in applications like augmented reality glasses and head-up displays.
Innovation Solution
The integration of micro LED elements with a light convergence portion within the pixel, where microlenses are used to converge light emitted by the micro LED elements, allowing for efficient light usage and improved brightness without enlarging the imaging optical system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the aperture of the lens or diameter of the reflection mirror is increased to converge light more effectively, then the light convergence efficiency is improved, but the size of the imaging optical system is increased
Solution Approach 1:
The imaging optical system is divided into multiple optical elements (lens and reflection mirror) that work together to achieve light convergence. Each element contributes to the overall convergence function, allowing effective light collection without requiring a single large aperture or diameter.
Solution Approach 2:
The optical elements are arranged in a nested configuration where the reflection mirror and lens work in combination, with the lens positioned to utilize light reflected by the mirror. This nested arrangement maximizes light convergence within a compact volume.
2Loss of energy
If the size of the imaging optical system is increased to improve light convergence, then the light convergence efficiency is improved, but the weight of the display device is increased
Solution Approach 1:
The imaging optical system is segmented into multiple smaller optical elements that collectively achieve the required light convergence. This segmentation allows the system to maintain effective light collection while minimizing the overall weight compared to a single large optical element.
Solution Approach 2:
The nested arrangement of optical elements allows compact integration, reducing the overall volume and weight of the imaging optical system while maintaining effective light convergence capability.
3Illumination intensity
If micro LED elements are used to achieve small size and high brightness, then the device characteristics are improved, but the effective usage of emitted light is reduced without increasing imaging optical system size
Solution Approach 1:
The optical elements are pre-configured to converge light in the direction of the combiner device. The lens and reflection mirror are positioned and shaped to preliminarily focus the emitted light from micro LED elements, maximizing the effective usage of emitted light without requiring a large imaging optical system.
Solution Approach 2:
The optical parameters of the lens (aperture, focal length) and reflection mirror (diameter, curvature) are optimized to achieve effective light convergence within a compact size. By carefully adjusting these parameters, the system achieves high brightness and effective light usage without increasing overall size.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances light convergence efficiency, enabling brighter displays and reduced power consumption while maintaining a compact form factor, suitable for applications like augmented reality glasses and head-up displays.
Implementation Method 1
a light convergence portion that converges light is disposed in the pixel
Implementation Method 2
micro light-emission elements that are minute light-emission elements... micro LED element including a plurality of minute light-emitting diode (LED) elements
Data Source
AI summary
An image display device includes a plurality of micro light-emission elements that constitute a pixel and that are provided on a driving circuit substrate. The micro light-emission element displays an image by emitting light to a side opposite to the driving circuit substrate. A light convergence portion that converges light is disposed in the pixel.